Fuel pump relay failures are a common and frustrating occurrence with the Volvo 850. A failure effectively immobilizes the car and many owners, myself included, carry a spare relay in the car so as to not get stuck on the road miles away from any Volvo dealer. The relays are unique to Volvo and cannot be purchased from a standard auto parts store. Read about the repair with pictures...less than $3.00 in parts if you're willing to take the time to do this repair!
Gas Tank Removal & Leak Fix Tutorial 1. Disconnect the negative battery cable for safety. 2. Block the front wheels, jack up the rear, use some jack stands to hold up the rear. 3. Remove the floor board to open up the area to access the top of the fuel pump and sender. Gas Tank Removal Question + Leak photo